In moist air, copper corrodes to produce a green layer on the surface. Give reason.

Explanation

### Step-by-Step Solution:

1. **Understanding Corrosion**: Corrosion is a chemical process where metals react with environmental factors, leading to deterioration. In the case of copper, this occurs when it is exposed to moist air.

2. **Components of Moist Air**: Moist air consists of various components, including oxygen (O₂), carbon dioxide (CO₂), and water vapor (H₂O). These components play a crucial role in the corrosion process.

3. **Reactions Involved**: When copper (Cu) is exposed to moist air, it reacts with the oxygen and carbon dioxide present in the air, as well as with the moisture (water). The reactions can be summarized as follows:
- Copper reacts with oxygen to form copper oxide (CuO).
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